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Docs update (comparison table)

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git-svn-id: http://pugixml.googlecode.com/svn/trunk@8 99668b35-9821-0410-8761-19e4c4f06640
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arseny.kapoulkine 2006-11-07 13:41:07 +00:00
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@ -27,6 +27,7 @@
</dt>
<dt><a href="#Parsing">Parsing process</a></dt>
<dt><a href="#Compliance">W3C compliance</a></dt>
<dt><a href="#ComparisonTable">Comparison with existing parsers</a></dt>
<dt><a href="#FAQ">FAQ</a></dt>
<dt><a href="#Bugs">Bugs</a></dt>
<dt><a href="#Future_work">Future work</a></dt>
@ -46,11 +47,12 @@ from scratch). The main features (call it USP) are:</p>
<ul>
<li>low memory consumption and fragmentation (the win over <i>pugxml</i> is ~1.3 times, <i>TinyXML</i>
- ~2.5 times, <i>Xerces (DOM)</i> - ~4.3 times <a href="#annot-1"><sup>1</sup></a>)</li>
- ~2.5 times, <i>Xerces (DOM)</i> - ~4.3 times <a href="#annot-1"><sup>1</sup></a>). Exact numbers can
be seen in <a href="#ComparisonTable">Comparison with existing parsers</a> section.</li>
<li>extremely high parsing speed (the win over <i>pugxml</i> is ~6 times, <i>TinyXML</i> - ~10
times, <i>Xerces-DOM</i> - ~17.6 times <a href="#annot-1"><sup>1</sup></a></li>
<li>extremely high parsing speed (well, I'm repeating myself, but it's so fast, that it outperforms
<i>expat</i> by <b>2.8 times</b> on test XML) <a href="#annot-2"><sup>2</sup></a></li>
<i>Expat</i> by <b>2.8 times</b> on test XML) <a href="#annot-2"><sup>2</sup></a></li>
<li>more or less standard-conformant (it will parse any standard-compliant file correctly in w3c-compliance
mode, with the exception of DTD related issues and XML namespaces)</li>
<li>pretty much error-ignorant (it will not choke on something like &lt;text&gt;You &amp; Me&lt;/text&gt;,
@ -937,6 +939,84 @@ parsers already.</p>
<hr>
<a name="ComparisonTable">
<h2>Comparison with existing parsers</h2>
<p>This table summarizes the comparison in terms of time and memory consumption between pugixml and
other parsers. For DOM parsers (all, except Expat, irrXML and SAX parser of XercesC), the process is
as follows:</p>
<ul>
<li>construct DOM tree from file, which is preloaded in memory (all parsers take const char* and size
as an input). 'parse time' means number of CPU clocks which is spent, 'parse allocs' - number of allocations,
'parse memory' - peak memory consumption
<li>traverse DOM tree to fill information from it into some structure (which is the same for all parsers,
of course). 'walk time' means number of CPU clocks which is spent, 'walk allocs' - number of allocations
</ul>
<p>For SAX parsers, the parse step is skipped (hence the N/A in relevant table cells), structure is
filled during 'walk' step.</p>
<p>For all parsers, 'total time' column means total time spent on the whole process, 'total allocs' -
total allocation count, 'total memory' - peak memory consumption for the whole process.</p>
<p>The tests were performed on a 1 Mb XML file with a small amount of text. They were compiled with
Microsoft Visual C++ 8.0 (2005) compiler in Release mode, with checked iterators/secure STL turned
off. The test system is AMD Sempron 2500+, 512 Mb RAM.</p>
<table cellspacing=0 cellpadding=2 border=1>
<tr><th>parser</th>
<th>parse time</th><th>parse allocs</th><th>parse memory</th>
<th>walk time</th><th>walk allocs</th>
<th>total time</th><th>total allocs</th><th>total memory</th></tr>
<tr><td><a href="http://xml.irrlicht3d.org/">irrXML</a></td>
<td>N/A</td><td>N/A</td><td>N/A</td>
<td>352 Mclocks</td><td>697 245</td>
<td>356 Mclocks</td><td>697 284</td><td>906 kb</td></tr>
<tr><td><a href="http://expat.sourceforge.net/">Expat</a></td>
<td>N/A</td><td>N/A</td><td>N/A</td>
<td>97 Mclocks</td><td>19</td>
<td>97 Mclocks</td><td>23</td><td>1028 kb</td></tr>
<tr><td><a href="http://tinyxml.sourceforge.net/">TinyXML</a></td>
<td>168 Mclocks</td><td>50 163</td><td>5447 kb</td>
<td>37 Mclocks</td><td>0</td>
<td>242 Mclocks</td><td>50 163</td><td>5447 kb</td></tr>
<tr><td><a href="http://www.codeproject.com/soap/pugxml.asp">PugXML</a></td>
<td>100 Mclocks</td><td>106 597</td><td>2747 kb</td>
<td>38 Mclocks</td><td>0</td>
<td>206 Mclocks</td><td>131 677</td><td>2855 kb</td></tr>
<tr><td><a href="http://xml.apache.org/xerces-c/">XercesC</a> SAX</td>
<td>N/A</td><td>N/A</td><td>N/A</td>
<td>411 Mclocks</td><td>70 380</td>
<td>411 Mclocks</td><td>70 495</td><td>243 kb</td></tr>
<tr><td><a href="http://xml.apache.org/xerces-c/">XercesC</a> DOM</td>
<td>300 Mclocks</td><td>30 491</td><td>9251 kb</td>
<td>65 Mclocks</td><td>1</td>
<td>367 Mclocks</td><td>30 492</td><td>9251 kb</td></tr>
<tr><td>pugixml</td>
<td>17 Mclocks</td><td>40</td><td>2154 kb</td>
<td>14 Mclocks</td><td>0</td>
<td>32 Mclocks</td><td>40</td><td>2154 kb</td></tr>
<tr><td>pugixml (test of non-destructive parsing)</td>
<td>12 Mclocks</td><td>51</td><td>1632 kb</td>
<td>21 Mclocks</td><td>0</td>
<td>34 Mclocks</td><td>51</td><td>1632 kb</td></tr>
</table>
<p>Note, that non-destructive parsing mode was just a test and is not yet in <i>pugixml</i>.</p>
<hr>
<a name="FAQ">
<h2>FAQ</h2>